Yesterday the weatherman started talking snow, sleet, frost, and rain – we were in for an early taster of winter. If you live somewhere warm and sunny that never gets snow you may have an idea of what it must be like to have a Snow Day, you may even be wondering what colour snow is. Or you may assume that snow, naturally, must be white. It’s not white, it’s every shade of blue. Impossible to describe, hard to photograph, lovely to witness.